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c1cc1552 CM |
1 | /* |
2 | * Based on arch/arm/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995-2005 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/export.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/bootmem.h> | |
26 | #include <linux/mman.h> | |
27 | #include <linux/nodemask.h> | |
28 | #include <linux/initrd.h> | |
29 | #include <linux/gfp.h> | |
30 | #include <linux/memblock.h> | |
31 | #include <linux/sort.h> | |
32 | #include <linux/of_fdt.h> | |
33 | ||
34 | #include <asm/prom.h> | |
35 | #include <asm/sections.h> | |
36 | #include <asm/setup.h> | |
37 | #include <asm/sizes.h> | |
38 | #include <asm/tlb.h> | |
39 | ||
40 | #include "mm.h" | |
41 | ||
42 | static unsigned long phys_initrd_start __initdata = 0; | |
43 | static unsigned long phys_initrd_size __initdata = 0; | |
44 | ||
45 | phys_addr_t memstart_addr __read_mostly = 0; | |
46 | ||
47 | void __init early_init_dt_setup_initrd_arch(unsigned long start, | |
48 | unsigned long end) | |
49 | { | |
50 | phys_initrd_start = start; | |
51 | phys_initrd_size = end - start; | |
52 | } | |
53 | ||
54 | static int __init early_initrd(char *p) | |
55 | { | |
56 | unsigned long start, size; | |
57 | char *endp; | |
58 | ||
59 | start = memparse(p, &endp); | |
60 | if (*endp == ',') { | |
61 | size = memparse(endp + 1, NULL); | |
62 | ||
63 | phys_initrd_start = start; | |
64 | phys_initrd_size = size; | |
65 | } | |
66 | return 0; | |
67 | } | |
68 | early_param("initrd", early_initrd); | |
69 | ||
70 | #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) | |
71 | ||
72 | static void __init zone_sizes_init(unsigned long min, unsigned long max) | |
73 | { | |
74 | struct memblock_region *reg; | |
75 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
76 | unsigned long max_dma32 = min; | |
77 | ||
78 | memset(zone_size, 0, sizeof(zone_size)); | |
79 | ||
80 | #ifdef CONFIG_ZONE_DMA32 | |
81 | /* 4GB maximum for 32-bit only capable devices */ | |
938edf5c WD |
82 | max_dma32 = max(min, min(max, MAX_DMA32_PFN)); |
83 | zone_size[ZONE_DMA32] = max_dma32 - min; | |
c1cc1552 CM |
84 | #endif |
85 | zone_size[ZONE_NORMAL] = max - max_dma32; | |
86 | ||
87 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); | |
88 | ||
89 | for_each_memblock(memory, reg) { | |
90 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
91 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
92 | ||
93 | if (start >= max) | |
94 | continue; | |
95 | #ifdef CONFIG_ZONE_DMA32 | |
96 | if (start < max_dma32) { | |
97 | unsigned long dma_end = min(end, max_dma32); | |
98 | zhole_size[ZONE_DMA32] -= dma_end - start; | |
99 | } | |
100 | #endif | |
101 | if (end > max_dma32) { | |
102 | unsigned long normal_end = min(end, max); | |
103 | unsigned long normal_start = max(start, max_dma32); | |
104 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; | |
105 | } | |
106 | } | |
107 | ||
108 | free_area_init_node(0, zone_size, min, zhole_size); | |
109 | } | |
110 | ||
111 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID | |
112 | int pfn_valid(unsigned long pfn) | |
113 | { | |
114 | return memblock_is_memory(pfn << PAGE_SHIFT); | |
115 | } | |
116 | EXPORT_SYMBOL(pfn_valid); | |
117 | #endif | |
118 | ||
119 | #ifndef CONFIG_SPARSEMEM | |
120 | static void arm64_memory_present(void) | |
121 | { | |
122 | } | |
123 | #else | |
124 | static void arm64_memory_present(void) | |
125 | { | |
126 | struct memblock_region *reg; | |
127 | ||
128 | for_each_memblock(memory, reg) | |
129 | memory_present(0, memblock_region_memory_base_pfn(reg), | |
130 | memblock_region_memory_end_pfn(reg)); | |
131 | } | |
132 | #endif | |
133 | ||
134 | void __init arm64_memblock_init(void) | |
135 | { | |
136 | u64 *reserve_map, base, size; | |
137 | ||
138 | /* Register the kernel text, kernel data and initrd with memblock */ | |
139 | memblock_reserve(__pa(_text), _end - _text); | |
140 | #ifdef CONFIG_BLK_DEV_INITRD | |
141 | if (phys_initrd_size) { | |
142 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
143 | ||
144 | /* Now convert initrd to virtual addresses */ | |
145 | initrd_start = __phys_to_virt(phys_initrd_start); | |
146 | initrd_end = initrd_start + phys_initrd_size; | |
147 | } | |
148 | #endif | |
149 | ||
150 | /* | |
151 | * Reserve the page tables. These are already in use, | |
152 | * and can only be in node 0. | |
153 | */ | |
154 | memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); | |
155 | memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); | |
156 | ||
157 | /* Reserve the dtb region */ | |
158 | memblock_reserve(virt_to_phys(initial_boot_params), | |
159 | be32_to_cpu(initial_boot_params->totalsize)); | |
160 | ||
161 | /* | |
162 | * Process the reserve map. This will probably overlap the initrd | |
163 | * and dtb locations which are already reserved, but overlapping | |
164 | * doesn't hurt anything | |
165 | */ | |
166 | reserve_map = ((void*)initial_boot_params) + | |
167 | be32_to_cpu(initial_boot_params->off_mem_rsvmap); | |
168 | while (1) { | |
169 | base = be64_to_cpup(reserve_map++); | |
170 | size = be64_to_cpup(reserve_map++); | |
171 | if (!size) | |
172 | break; | |
173 | memblock_reserve(base, size); | |
174 | } | |
175 | ||
176 | memblock_allow_resize(); | |
177 | memblock_dump_all(); | |
178 | } | |
179 | ||
180 | void __init bootmem_init(void) | |
181 | { | |
182 | unsigned long min, max; | |
183 | ||
184 | min = PFN_UP(memblock_start_of_DRAM()); | |
185 | max = PFN_DOWN(memblock_end_of_DRAM()); | |
186 | ||
187 | /* | |
188 | * Sparsemem tries to allocate bootmem in memory_present(), so must be | |
189 | * done after the fixed reservations. | |
190 | */ | |
191 | arm64_memory_present(); | |
192 | ||
193 | sparse_init(); | |
194 | zone_sizes_init(min, max); | |
195 | ||
196 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; | |
197 | max_pfn = max_low_pfn = max; | |
198 | } | |
199 | ||
c1cc1552 CM |
200 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
201 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) | |
202 | { | |
203 | struct page *start_pg, *end_pg; | |
204 | unsigned long pg, pgend; | |
205 | ||
206 | /* | |
207 | * Convert start_pfn/end_pfn to a struct page pointer. | |
208 | */ | |
209 | start_pg = pfn_to_page(start_pfn - 1) + 1; | |
210 | end_pg = pfn_to_page(end_pfn - 1) + 1; | |
211 | ||
212 | /* | |
213 | * Convert to physical addresses, and round start upwards and end | |
214 | * downwards. | |
215 | */ | |
216 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); | |
217 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
218 | ||
219 | /* | |
220 | * If there are free pages between these, free the section of the | |
221 | * memmap array. | |
222 | */ | |
223 | if (pg < pgend) | |
224 | free_bootmem(pg, pgend - pg); | |
225 | } | |
226 | ||
227 | /* | |
228 | * The mem_map array can get very big. Free the unused area of the memory map. | |
229 | */ | |
230 | static void __init free_unused_memmap(void) | |
231 | { | |
232 | unsigned long start, prev_end = 0; | |
233 | struct memblock_region *reg; | |
234 | ||
235 | for_each_memblock(memory, reg) { | |
236 | start = __phys_to_pfn(reg->base); | |
237 | ||
238 | #ifdef CONFIG_SPARSEMEM | |
239 | /* | |
240 | * Take care not to free memmap entries that don't exist due | |
241 | * to SPARSEMEM sections which aren't present. | |
242 | */ | |
243 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); | |
244 | #endif | |
245 | /* | |
246 | * If we had a previous bank, and there is a space between the | |
247 | * current bank and the previous, free it. | |
248 | */ | |
249 | if (prev_end && prev_end < start) | |
250 | free_memmap(prev_end, start); | |
251 | ||
252 | /* | |
253 | * Align up here since the VM subsystem insists that the | |
254 | * memmap entries are valid from the bank end aligned to | |
255 | * MAX_ORDER_NR_PAGES. | |
256 | */ | |
257 | prev_end = ALIGN(start + __phys_to_pfn(reg->size), | |
258 | MAX_ORDER_NR_PAGES); | |
259 | } | |
260 | ||
261 | #ifdef CONFIG_SPARSEMEM | |
262 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) | |
263 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); | |
264 | #endif | |
265 | } | |
266 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
267 | ||
268 | /* | |
269 | * mem_init() marks the free areas in the mem_map and tells us how much memory | |
270 | * is free. This is done after various parts of the system have claimed their | |
271 | * memory after the kernel image. | |
272 | */ | |
273 | void __init mem_init(void) | |
274 | { | |
27222a3d | 275 | arm64_swiotlb_init(); |
c1cc1552 CM |
276 | |
277 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; | |
278 | ||
279 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
c1cc1552 CM |
280 | free_unused_memmap(); |
281 | #endif | |
bee4ebd1 | 282 | /* this will put all unused low memory onto the freelists */ |
0c988534 | 283 | free_all_bootmem(); |
c1cc1552 | 284 | |
bee4ebd1 | 285 | mem_init_print_info(); |
c1cc1552 CM |
286 | |
287 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 | |
288 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
289 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
290 | ||
291 | pr_notice("Virtual kernel memory layout:\n" | |
292 | " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
293 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
294 | " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
295 | #endif | |
296 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
297 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
298 | " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" | |
299 | " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" | |
300 | " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", | |
301 | MLM(VMALLOC_START, VMALLOC_END), | |
302 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
303 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), | |
304 | (unsigned long)virt_to_page(high_memory)), | |
305 | #endif | |
306 | MLM(MODULES_VADDR, MODULES_END), | |
307 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
308 | ||
309 | MLK_ROUNDUP(__init_begin, __init_end), | |
310 | MLK_ROUNDUP(_text, _etext), | |
311 | MLK_ROUNDUP(_sdata, _edata)); | |
312 | ||
313 | #undef MLK | |
314 | #undef MLM | |
315 | #undef MLK_ROUNDUP | |
316 | ||
317 | /* | |
318 | * Check boundaries twice: Some fundamental inconsistencies can be | |
319 | * detected at build time already. | |
320 | */ | |
321 | #ifdef CONFIG_COMPAT | |
322 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); | |
323 | #endif | |
324 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
325 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
326 | ||
bee4ebd1 | 327 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
c1cc1552 CM |
328 | extern int sysctl_overcommit_memory; |
329 | /* | |
330 | * On a machine this small we won't get anywhere without | |
331 | * overcommit, so turn it on by default. | |
332 | */ | |
333 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
334 | } | |
335 | } | |
336 | ||
337 | void free_initmem(void) | |
338 | { | |
9af5b807 | 339 | free_initmem_default(0); |
c1cc1552 CM |
340 | } |
341 | ||
342 | #ifdef CONFIG_BLK_DEV_INITRD | |
343 | ||
344 | static int keep_initrd; | |
345 | ||
346 | void free_initrd_mem(unsigned long start, unsigned long end) | |
347 | { | |
9af5b807 JL |
348 | if (!keep_initrd) |
349 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); | |
c1cc1552 CM |
350 | } |
351 | ||
352 | static int __init keepinitrd_setup(char *__unused) | |
353 | { | |
354 | keep_initrd = 1; | |
355 | return 1; | |
356 | } | |
357 | ||
358 | __setup("keepinitrd", keepinitrd_setup); | |
359 | #endif |